Top roll for drafting frames



Jan. 22, 1957 Filed July 28. 1952 J. WALMSLEY TOP ROLL FOR DRAFTNG FRAMES 2 Sheets-Sheet 1 Jan. 22, 1957 J, w s 2,778,066

TOP ROLL FOR DRAFTNG FRAMES Filed July 28, 1952 2 Sheets-Sheet 2 2,178j66 roi nonn non onisna uuemnnmns a lol'ifixwiaiinsl osw ldiiiistiggm'enngtqu, ali n ngs ful initeiitile maehinerw althongh in use is noeeonfifiw thereto.

The term shaft,".as used in this specification, includes arbors, spin'dlesfaxles' and like'patttswh'ic areiotatable, absolutely or 'relativelfi inloth'eF parts: i

The difficulty of confining oil tothe-parts being lubricated has long been a s eriousproblemin =textile rnachin= eryn ln textile drafting systems, fog-instance, thei e' are rows of rol l ers, the top rollers (known' as loose boss top-rollers) 'of the row or rowswhieh rotate fastest being adapted to rotate freely on their arbor-and those of the other rows'jknpwn as fi xed -boss atopnrollers being keyed or.-fixed to, orintegral with, :theii arborsr In the conventional machinery it is necessary-do oil the-arbors where they carry the loose boss top rollers, and in the case of the fixed 'bos's-toproller's 'it-is necessary to oil those" parts-of the arbors in' 'con'tact with thEiaddles and with the cap bar nebs. There is, therefore, considerable risk, particularly during the oiling operation, that oil will get into contact with the outer surface of the bosses and that damage to the textile fibres will thereby result. The existence of free oil, moreover, leads to the formation of oily fluff and its adherence to the drafting system. Moreover, oiling needs to be performed at frequent intervals, usually more than once a day, and is therefore expensive both in material and in labour.

To overcome these disadvantages, it has been proposed to line the inside of the loose boss top rollers with sintered metal bushes and to provide the saddle and the cap bar nebs with sintered metal bearing inserts.

A general object of the present invention is a simple and convenient method of producing a shaft formed with a sintered metal bearing part or parts. A more specific object is to provide cheaper and more convenient means of converting conventional textile machinery into machinery incorporating sintered metal bearings and of effecting replacements.

According to the invention, a shaft is cast or moulded in situ within a sintered metal bush or bushes. If a metal shaft is required it is preferably die-cast, whilst a plastic shaft may be moulded in situ within the bush or bushes. The metal shaft may be a zinc or aluminum alloy.

It is to be understood that the term bush includes end thrust bearings.

The sintered metal may be of bronze or ferrous material, and may be porous to be capable of impregnation with oil, or it may contain graphite so as to be selflubricating.

The shaft may be shaped so that it has flange portions contacting the edges of the bush or bushes. In other words, in the finished article, the bush or each bush is accommodated flush within a recessed portion of the shaft. It will be understood that it will not normally be necessary to provide means whereby a bush will be positively interlocked with the shaft because especially when the sintered metal is porous, the material of the 23:? sh'aft will Be forced 'lduriiigIith 'ea'stili r mould ingato I grip afirmly on toithini11surface of-th bush; v

\Vheri'thiinvefition is water answerer carrying looseboss'ilraftin'g' rollefs' the leri'gt at the; biisheamay' pe -t exths'ii'r'e'with' 'br; 'shortefthah the length of the rollers,- the-centrist portion ost'liarboa being for'med in theusuahway witha recess, between flanges, to -receive t-he; saddle *lli e dir'rien'sions of the arb'ors are preferably such that theloose"bt'is's" top'frollfr's of the existing wnvemimamype.

0 are"sni'igly'received an the sintered metal bushes- Withloose boss top .rollers the invention-is i thei'efore especially useful since it as sists in the conversion of conventiohal machinery toinachineryincorpotating sintered:

meta-l b'ii's'hes. The existing lease boss Itop {rollers can be o retained :and the oldmans re placed bymew; ones, ac-" cording to theinv'ention, having theysarnedimensions as the old. It will be appreciated that this is a cheaper operation than boring the loose boss top;rol1ers 'in 'order to receive; sinter 'ed-rhetal b'ush which is pressed in with an" interference fit. f Moi'eover, the' conversion -'f-ro rn the conventiohal-iiiachihe ry can be very speedily-carriedouta It-will further be'appreciated thatQif thesintered-metal bushes are" of thetypeimpreg'natd witha lubricant'suc h. as'oil, the oiling operation canbe carried-out byremov-f ing the arbor' as such from the machine and allowing it to soak in a bath of' an until s'ufiieient-pihhas been ab sor'bd, 'whe'reafter all. free oil is wiped off before replac ingtjthe' arbor inth e machine Bfthis means,- the risle: of free 'oil issubstantiallycompletely eliminated- 5- b sintered metal-bushes may .be provided-both atg tha t partaof the jarboi' which'rotats beneathjhehsaddle; and:

at-th ends of the arbor,- where'the arbor rotates withi'n the" respective capbar neb'. arbor so constructe d may 13" used i n connection withfixed boss top rollers.

The invention is illustrated by way of example in the accompanying drawings in which:

Figure 1 is a view, partly in longitudinal section, of a shaft according to the invention,

Figure 2 is a section taken on the line IIII of Figure 1,

Figure 3 is a plan view, partly insection, of part of a textile drafting system provided with a shaft as shown in Figures 1 and 2,

Figure 4 is a section taken on the line IV-IV of Figure 3,

Figure 5 is a section taken on the line VV of Figure 3,

Figure 6 is a longitudinal section of another form of shaft embodying the invention,

Figure 7 is an end view of Figure 6,

Figure 8 is a plan view, partly in section, of part of a textile drafting system provided with a shaft as shown in Figures 6 and 7.

Figure 9 is a section taken on the line IX-IX of Figure 8, and

Figure 10 is a section taken on the line X-X of Fig ure 8.

The shaft shown in Figures 1 and 2 has ends 2 of reduced diameter and a flange 3 on each side of its central portion 4. It is produced by being die-cast within a die of complementary shapewithin which is positioned a pair of sintered metal bushes 5 which, in the finished shaft are snugly accommodated in annular recesses 6, the bushes 5 being thicker than the depths of the recesses 6 so as to project above the surface of the adjacent parts of the shaft. The shaft having been moulded in situ within the surrounding bushes, is circumferentially cohered to the bushes, thus providing a shaft and bush structure which may be installed and removed as a unit.

Referring to Figures 3-5 the ends 2 of the shaft are rotatably mounted in cap bar nebs 7, the central portion 3 4 being borne upon by an inverted U-shaped portion 8 of a saddle'9;

Rotatably mounted on the bushes are loose boss top rollers 10 which are covered in the customary manner with flexible material 11 such as leather. H

The shaft shown in Figures 6 and 7 has ends 12 of reduced diameter and a flange 13 on each side of its central portion 4. The shaft is produced by having been die-cast within a die, of complementary shape within which were positioned a sintered metal bush 14 and a pair of sintered metal bushes 15. In the finished shaft, the bush 14 is snugly accommodated within an annular recess 16 at the central portion 4, while the bushes are on the ends 12 of the shaft.

Referring to Figures 8-10 the bushes 15 are rotatably mounted in cap bar nebs 7, while the bush 14 is borne upon by an inverted U-shaped portion 8 of a saddle 9. The flanges 13 constitute integral fixed boss top rollers each of which is covered with a cot 11 formed of flexible materialsuch as leather.

I claim:

1.-A shaft, said shaft having an annular recess, and a sintered metal bush surrounding said shaft and being accommodated in the recess, said bush projecting above the surface of the adjacent parts of the shaft.

2. In a textile drafting system, a shaft having portions of enlarged diameter, a sintered metal bush on the shaft between two adjacent portions of enlarged diameter, and a loose boss top roller mounted on the bush.

3. In a textile drafting system, a shaft, said shaft having an annular recess, a sintered metal bush accommodated in the recess, and a loose boss top roller mounted on the bush.

4. In a textile drafting system, a shaft, said shaft having an annular recess, a sintered metal bush surrounding said shaft and being accommodated in the recess, said bush projecting above the surface of the adjacent parts of the shaft, and a loose boss top roller mounted on the 'bush, the roller'projecting beyond the bush on either side thereof.

5. In a textile drafting system, a shaft formed in situ Within and being circumferentially cohered to a sintered metal bush located in an annular recess of the shaft, and a loose boss top roller mounted on the bush.

6. In a textile drafting system, a shaft formed in situ within and being circumferentially cohered to a sintered metal bush, said bush surrounding said shaft and being accommodated in an annular recess of said shaft and projecting above the surface of the adjacent parts of the shaft, and. a loose boss top roller mounted on the bush,

the roller projecting beyond the bush from either side thereof.

7. A shaft, said shaft having an annular recess, and a sintered metal bush surrounding said shaft and being accommodated in the recess, and projecting above the surface of the adjacent parts of the shaft, the shaft being formed in situ within and being circumferentially cohered to said bush.

References Cited in the file of this patent UNITED STATES PATENTS 

